package com.zkk.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zkk.reggie.common.CustomException;
import com.zkk.reggie.dto.SetmealDto;
import com.zkk.reggie.entity.Setmeal;
import com.zkk.reggie.entity.SetmealDish;
import com.zkk.reggie.mapper.SetmealMapper;
import com.zkk.reggie.service.SetmealDishService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class SetmealService extends ServiceImpl<SetmealMapper, Setmeal> implements com.zkk.reggie.service.SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;

    /**
     * 新增套餐 同时保存套餐和菜品的关联关系
     * @param setmealDto
     */
    @Override
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {

        //保存套餐的基本信息，操作setmeal表 执行insert操作
        this.save(setmealDto);

        //保存套餐和菜品的关联信息,操作setmeal_dish表，执行insert操作
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes = setmealDishes.stream().map(((item) -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        })).collect(Collectors.toList());

        setmealDishService.saveBatch(setmealDishes);
    }


    /**
     * 删除套餐 同时删除该套餐所关联的菜品关系
     * @param ids
     */
    @Override
    @Transactional
    public void removeWithDish(List<Long> ids) {

        //查询套餐状态，确定是否可以删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId,ids);
        queryWrapper.eq(Setmeal::getStatus,1);

        int count = this.count(queryWrapper);
        if (count > 0){
            //如果不能删除，抛出一个业务异常
            throw new CustomException("套餐正在售卖中，不能删除！");
        }

        //如果可以删除，先删除套餐中的基本数据 setmeal表
        this.removeByIds(ids);

        //删除关系表中的数据 setmeal_dish表
        LambdaQueryWrapper<SetmealDish> setmealDishLambdaQueryWrapper = new LambdaQueryWrapper<>();
//        ids.stream().map((item) ->{
//            setmealDishLambdaQueryWrapper.eq(SetmealDish::getSetmealId,item);
//            setmealDishService.remove(setmealDishLambdaQueryWrapper);
//            return null;
//        });
        setmealDishLambdaQueryWrapper.in(SetmealDish::getSetmealId,ids);
        setmealDishService.remove(setmealDishLambdaQueryWrapper);

    }
}
